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Y H. A. HARVEY.

- WIRE SCREW NAIL. v No. 377,452. Patented Feb. 7, 188 8. K

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,-UNITED STATES PATENT OFFICE- i I -HAYWARD A. HARVEY, OF", ORANGE, NEWJERSEY.

' WIRE SCREWJ-NAIL.

SPECIFICATION forming part of Letters Patent No; 377,452, a ateaFebruary 7,1888.

7 Application filed July 29, 1887. Serial No. 245.589. 'lNo model.) 1 VI To dz; whom it may concern:

Be it known that I, HAYWARD A. HARVEY,

of Orange, New Jersey, have invented a cer-,

taiu Improvement inWire Screw-Nails, of WhlCl 1 the following is aspecification.

This improvement relates. especially to wire nails, the peculiarity ofwhich is that they are comparatively slender in proportion to theirlength.

The invention consists in providing the end of the blank which isto'serve as the-head with'a V-shaped notch of such depth that when the'nailis used the blows of the hammer upon its bifurcated end spread apart thetwo branches thereof and make them sub serve the purpose of ahead.Ordinarily the notch is not entirely obliterated by the act of drivingin the nail, and enough of it remains to'serve as a nickforftheengagement of a screw-driver, byineans of which the screwnail may beunscrewed from the woodinto which it has been driven. A

The formation of the bifurcated heads is preferably effected in the actof severing the blanks from the coil'of wire from which they are made bythe use of suitable V-shaped cutting-dies. The blanks thus successivelyproduced are each bifurcated at one end and chisel-pointed at theotherend. Having been severed from the coil, the blanks may besuccessively fed to athreading-machine, by means of which a screw-threadmay be formed ,upon

theirbodies. It is not, however, essential that the blanks be severedfrom the coil before being threaded, because the coil of wire which maybe either continuous" or formed upon the'wire at suitable intervals,leaving blank or unthreaded portions at and adjoining the places wherethe severing operations are to be performed.

It will of course be understoodthat the notched or bifurcated head maybe employed for wire screw-nails having points of any shape, such asconical points or pyramidal points; but as wire screw-nails areordinarily used for driving in comparatively soft wood,

the chisel-point will be found to answer every purpose, and the woodwill not offer sufficient resistance to prevent the screw-nail from being readily unscrewed and removed by means of a screw-driver.

The accompanying drawings of wire.screw nails embodyingthe invention areas follows;

Figurel is a perspective view of a wirescrew- 55 nail bifurcated at oneend and chisel-pointed at the other," having a. rolled screw-threadformed upon the whole of its body from the branches of its bifurcatedhead. Fig.3 is' an elevation of a conically-pointed wirerscrew.

nailembodying the invention of ,thebifureated' 6 5 or notched head, andhaving theporti'onof'its shank adjoining the head unthrea'ded." Fig. 4is an elevation exhibiting the effect pro;

vduced upon the head, of the wire screw-inail;

the act of driving it'int'o .79

shown in liig. 3 by wood. a a. v The characteristic features of screw nals it that their bodiesvA, or any desired portions thereof, are providedwith a screw thread,f a; 5

simultaneously produced in theact of sever- 8 ing the blanks from thecoil of wire from which they are made.

What is claimed as the invention is- 1 1. A wire screw-nail having oneend suitably-pointed, and having its opposite end 9c p notched orbifurcated, but of the samefdiame ter as its body, and having its bodyor] any desired portion thereof provided with ascrewthread,substantially as shown and described.

'2. A wire screw-nail having'a chisel-point 5 and a notched orbifurcated end, and a body the whole or any desired ,port ion of whichis s provided with a screw thread, substantially as shown and described.

Witnesses: v

A.;M. JoNEs, y 'E. H. WILLI Ms.

H. HAR EY;

